JP2003163121A - Low noise transformer and reactor - Google Patents

Low noise transformer and reactor

Info

Publication number
JP2003163121A
JP2003163121A JP2001362018A JP2001362018A JP2003163121A JP 2003163121 A JP2003163121 A JP 2003163121A JP 2001362018 A JP2001362018 A JP 2001362018A JP 2001362018 A JP2001362018 A JP 2001362018A JP 2003163121 A JP2003163121 A JP 2003163121A
Authority
JP
Japan
Prior art keywords
steel sheet
reactor
low noise
vibration
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001362018A
Other languages
Japanese (ja)
Inventor
Osamu Akisue
Masahiro Fujikura
Nobuo Kadowaki
Masahito Mizogami
Takashi Mogi
雅人 溝上
治 秋末
尚 茂木
昌浩 藤倉
伸生 門脇
Original Assignee
Nippon Steel Corp
新日本製鐵株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp, 新日本製鐵株式会社 filed Critical Nippon Steel Corp
Priority to JP2001362018A priority Critical patent/JP2003163121A/en
Publication of JP2003163121A publication Critical patent/JP2003163121A/en
Pending legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low noise transformer which have a resin intermediate layer to control the vibration of an entire steel sheet, achieves low noise effectively and generates less vibration, and a reactor. <P>SOLUTION: The low noise transformer and the reactor used for electricity and electrical apparatuses are provided with a multiple-layer steel sheet to absorb vibration as a magnetic shielding material to shield a wet magnetic field, especially provided with a multiple-layer electromagnetic steel sheet having the resin layer of 10 to 100 μm between the laminates. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low noise transformer and a reactor using a multi-layered electromagnetic steel sheet as a magnetic shield material for a transformer and a reactor, which generates less vibration.

[0002]

2. Description of the Related Art In magnetic materials widely used in electric and electronic devices, the degree of change in length when a magnetic field is applied (this is called magnetostriction) causes transformer noise, which is an important factor in quality control. It is one of the evaluation items. In recent years, noise from electrical equipment has become more severely regulated along with the demand for a comfortable living environment. For this reason, research into noise reduction by reducing magnetostriction is being actively conducted.

Significant advances have been made in the unidirectional electrical steel sheet used for the core of the transformer, and there is a method of reducing the magnetostriction by reducing the return magnetic domain. The reflux magnetic domain referred to here is a region having a magnetization that is oriented at right angles to the magnetic field application direction. Magnetostriction occurs when this magnetization moves in a direction parallel to the magnetic field by the applied magnetic field. Therefore, the smaller the return magnetic domain amount, the smaller the magnetostriction.

On the other hand, not only the reduction of the magnetostriction of the steel sheet but also the method of suppressing the vibration generated by the iron core is attempted to reduce the noise. As a method of reducing noise by suppressing the vibration generated by the iron core, for example, a method of providing an air space or silicone rubber to cut off the propagation of the vibration (Japanese Patent Application Laid-Open No. Hei 5-
251246), a method of arranging a damping material and a sound absorbing material outside the iron core leg to reduce noise (JP-A-8-45751, JP-A-2000-82622, and JP-A-2000-12404).
4), a method of fixing the gap portion of the reactor with an adhesive that suppresses vibration (Japanese Patent Laid-Open No. 8-111322), and a method of using an electromagnetic steel sheet having a resin intermediate layer (Japanese Patent Laid-Open No. 8-2503).
39) etc. These methods have mainly been used to reduce the magnetostriction of the steel sheet or the vibration of the iron core to reduce the noise of electrical equipment.

[0005]

However, there is a strong demand for further noise reduction of electric equipment, and more advanced technology is required to achieve the purpose. The conventional research on noise reduction has been mainly aimed at reducing the magnetostriction of the steel sheet due to the disappearance of the reflux magnetic domain. However, not only the noise generated from the transformer core, but also the leakage magnetic flux from the core flows into the electromagnetic steel plate used for the magnetic shield material, and there is a phenomenon that the magnetic shield plate vibrates due to the change in the magnetic flux due to alternating current. Forming the source.

Similarly, a power reactor is provided with a gap of an iron core to form a magnetic circuit, and a winding is wound on the outside to excite the magnetic circuit. In the gap portion, magnetic flux spreads (fringing magnetic flux) and leaks. It flows into the magnetic shield material and causes vibration. In particular, in the air-core reactor, most of the magnetic flux from the winding passes through the magnetic shield, which causes large vibration.

As a method for positively suppressing the vibration of the magnetic shield material against such a problem, a method of fixing the vibration to the outer frame of a tank or the like by a bushing without transmitting the vibration is adopted, but it is completely erased. Can not.

An object of the present invention is to provide a low noise transformer or reactor which is provided with a resin intermediate layer for suppressing the vibration of the entire steel sheet for magnetic shield and which effectively realizes noise reduction and which causes less vibration. is there.

[0009]

The concrete means of the present invention are as follows. (1) A low noise transformer and a reactor, comprising a multi-layer steel sheet that absorbs vibration as a magnetic shield material that shields a leakage magnetic field. (2) In low noise transformers and reactors, 10 to 1 is provided between the layers as a magnetic shield material that shields a leakage magnetic field.
A low noise transformer and a reactor comprising a multi-layer electromagnetic steel sheet having a resin layer of 00 μm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the main methods for reducing noise to date have been to reduce the magnetostriction of the steel sheet and reduce the surface vibration. In addition, it has a vibration-proof structure that does not propagate the vibration of the iron core to the outside. However, the present inventors focused their attention on magnetic shield materials other than the iron core of the transformer, and conducted earnest research in order to effectively realize a method for reducing noise. Hereinafter, the present invention will be described based on Examples.

FIG. 1 shows the structure of the multi-layer steel sheet for magnetic shield used in the present invention. A steel plate in which the damping resin 2 was sandwiched between two electromagnetic steel plates 1 and 3 having good magnetic shield characteristics and high magnetic permeability was used. Here, the damping resin 2 may be, for example, a polyester type, an olefin type, a polyisobutylene type, or the like that absorbs vibration, and the resin thickness is preferably 10 μm or more. Further, if the resin layer is thick, it protrudes from the steel sheet during shearing, so it is desirable that the thickness is 100 μm or less.

FIG. 2 shows an example in which the multi-layer steel sheet for magnetic shield 7 is installed in a transformer, and the magnetic shield 7 is arranged inside the tank side wall 9 surrounding the iron core 4 and the winding 6.
In the example of FIG. 2, the magnetic flux is passed through the winding 6 of the iron core 4, but the magnetic flux may be placed at the same position as the conventional magnetic shield material. Absent.

[0013]

[Example] [Example 1] A plate thickness of 0.
Five 27 mm unidirectional electrical steel sheets were used, and nothing was inserted between the laminates: A (comparative example) and olefin film resin inserted: B (inventive example) on the wall surface of the transformer. Laminated and arranged as magnetic shield steel plates, assembled a 3-phase transformer of 50MVA, and 50Hz1.5
The noise in the state excited by T was measured. The thickness of the resin layer in B was 50 μm for each layer. The results are shown in Table 1. As is clear from Table 1, in the transformer B using the magnetic shield manufactured from the material satisfying the conditions of the present invention, the noise could be reduced.

[0014]

[Table 1]

[Embodiment 2] Each of 50 unidirectional electrical steel sheets having a thickness of 0.35 mm produced by a conventional method, and nothing is inserted between the laminated layers: C (Comparative Example), olefin film Resin (D) (Example of the present invention) is placed on the wall surface of the transformer as a magnetically shielded steel plate, and a three-phase transformer of 500 MVA is assembled at 50 Hz.
The noise in the state excited at 1.6 T was measured. still,
In D, each resin layer had a thickness of 50 μm. The results are shown in Table 2. As is apparent from Table 2, in the transformer D using the magnetic shield manufactured from the material satisfying the conditions of the present invention, the noise could be reduced.

[0016]

[Table 2]

[0017]

As described above, according to the present invention, the resin intermediate layer for suppressing the vibration perpendicular to the steel plate surface prevents the vibration of the magnetic shield material and effectively realizes the low noise. A transformer or a reactor can be easily provided, the noise of electric equipment can be reduced, and the industrial advantage is extremely large.

[Brief description of drawings]

FIG. 1 shows a multi-layer steel sheet used for a magnetic shield.

FIG. 2 is an example in which a multi-layer steel sheet for magnetic shielding is arranged in a transformer.

[Explanation of symbols]

1, 3 Electromagnetic steel plate 2 Damping resin 4 Iron core 5 Iron core axial bolt 6 Winding 7 Shield 8 Outer box 9 Tank side wall 10 Fixing stand 11 Anti-vibration stand 12 Base

Front page continuation (51) Int.Cl. 7 Identification code FI theme code (reference) H05K 9/00 H01F 31/00 S (72) Inventor Masato Mizoue 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Inside the Technology Development Headquarters (72) Inventor Nobuo Kadowaki 5-3 Tokai-cho, Tokai City, Aichi Prefecture Nippon Steel Co., Ltd. Nagoya Steel Works (72) Inventor Osamu Akisue 20-1 Shintomi, Futtsu City, Chiba Nippon Steel F-term in Technology Development Division of stock company (reference) 5E058 AA23 AA24 BB19 CC13 CC15 5E321 BB25 GG07 GH05

Claims (2)

[Claims]
1. A low noise transformer and a reactor comprising a multi-layered steel sheet that absorbs vibration as a magnetic shield material that shields a leakage magnetic field.
2. A low noise transformer and a reactor comprising a multi-layer electromagnetic steel sheet having a resin layer of 10 to 100 μm between laminated layers as a magnetic shield material for shielding a leakage magnetic field, and Reactor.
JP2001362018A 2001-11-28 2001-11-28 Low noise transformer and reactor Pending JP2003163121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001362018A JP2003163121A (en) 2001-11-28 2001-11-28 Low noise transformer and reactor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001362018A JP2003163121A (en) 2001-11-28 2001-11-28 Low noise transformer and reactor

Publications (1)

Publication Number Publication Date
JP2003163121A true JP2003163121A (en) 2003-06-06

Family

ID=19172588

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001362018A Pending JP2003163121A (en) 2001-11-28 2001-11-28 Low noise transformer and reactor

Country Status (1)

Country Link
JP (1) JP2003163121A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010268530A (en) * 2009-05-12 2010-11-25 Murata Machinery Ltd Noncontact power supply system
JP2015512137A (en) * 2011-12-21 2015-04-23 ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトThyssenKrupp Steel Europe AG Magnetic field shield for electromagnetic field and vehicle incorporating magnetic field shield

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010268530A (en) * 2009-05-12 2010-11-25 Murata Machinery Ltd Noncontact power supply system
JP2015512137A (en) * 2011-12-21 2015-04-23 ティッセンクルップ スチール ヨーロッパ アクチェンゲゼルシャフトThyssenKrupp Steel Europe AG Magnetic field shield for electromagnetic field and vehicle incorporating magnetic field shield

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